The Stars of Musical Anime: K-on!

Moe girls love involving themselves in adorable antics and opportunities to allow their cuteness to shine, but none do it with as much style as the light music pop group Ho-kago Tea Time (HTT) from K-on! K-on!, based off of the music-themed manga series by the same title written by mangaka Kakifly, follows the adventures of high schoolers and amateur musicians Yui, Mio, Ritsu, Mugi, and Azusa as they revive their school's light music club and develop their talents on their respective instruments.
(Anime, K-ON!, K-ON!! 2)